Necessary preliminary tasks

• Remove rear BUMPER TRIM 

Version with M Technic aerodynamic kit: 

• Remove TRIM FROM BUMPER 
• Remove BOTTOM MIDDLE TRIM 

Remove cover cap (1) for tow lug.

Version with PDC  :

Remove all ULTRASONIC TRANSDUCERS (2).

Fig 1: Identifying Ultrasonic Transducers And Cover Cap

Courtesy of BMW OF NORTH AMERICA, INC.